Low background detector with enriched 116CdWO4 crystal scintillators to search for double beta decay of 116Cd

Details Low background detector with enriched 116CdWO4 crystal scintillators to search for double beta decay of 116Cd Low background detector with enriched 116CdWO4 crystal scintillators to search for double beta decay of 116Cd

2011-08-13

arxiv.org/abs/1108.2771v1

JINST 6:P08011,2011

Physics

Instrumentation and Detectors

24 pages, 13 figures, 3 tables, accepted for publication on Journal of Instrumentation

Scientific paper

10.1088/1748-0221/6/08/P08011

A cadmium tungstate crystal boule enriched in $^{116}$Cd to 82% with mass of 1868 g was grown by the low-thermal-gradient Czochralski technique. The isotopic composition of cadmium and the trace contamination of the crystal were estimated by High Resolution Inductively Coupled Plasma Mass-Spectrometry. The crystal scintillators produced from the boule were subjected to characterization that included measurements of transmittance and energy resolution. A low background scintillation detector with two $^{116}$CdWO$_4$ crystal scintillators (586 g and 589 g) was developed. The detector was running over 1727 h deep underground at the Gran Sasso National Laboratories of the INFN (Italy), which allowed to estimate the radioactive contamination of the enriched crystal scintillators. The radiopurity of a third $^{116}$CdWO$_4$ sample (326 g) was tested with the help of ultra-low background high purity germanium $\gamma$ detector. Monte Carlo simulations of double $\beta$ processes in $^{116}$Cd were used to estimate the sensitivity of an experiment to search for double $\beta$ decay of $^{116}$Cd.

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